The defense's jury consultant had her marked as PS (Prosecution Strike). You'd have to ask the prosecutors why they didn't strike her. Perhaps, as the article points out, there were other potential jurors they were more concerned about.

Dahlia Lathwick is an extremely knowledgable and respected reporter on Supreme Court and other issues. I don't think it's appropriate to paste her bio here, or any personal details. Nor do I want uninformed criticism of her here. If you don't know who she is, google her. If you disagree with her conclusions about something, say so and why. Don't insult her credentials or personally insult her.